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Heat, in its scientific meaning, is internal thermal energy that flows from one body of matter to another or from a system at a higher temperature to a system at a lower temperature. Temperature thus can be defined as a measure of the average molecular kinetic energy of a system. (i) When heat is transferred to or from an object the temperature of the object changes. What is heat? (ii) Name the three ways in which heat can be transferred. (iii)Describe an experiment to show how heat is transferred in a liquid. (iv)The water in an electric kettle is heated by the element and its handle is made from an insulating material. Apr 09, 2012 · Heat is the transfer of thermal energy from one object to another because of a difference in? The above equation states that the kinetic energy of a body is equal to one half the mass times the velocity squared. Potential Energy Another form of energy is potential energy: PE =mgz which means that the potential energy of a body is equal to the weight (mg) times the vertical distance (z) above a surface upon which the object would come to ... www.inthepresentsea.com
Mar 03, 2016 · Heat (grade 8) 1. “HEAT” 2. • Heat is a form of energy that flows from warmer bodies to colder bodies. 3. • It is viewed as a form of energy that is transferred from one body to another due to a difference in temperature. 4. • The SI unit of heat is joule (J). • Common unit of heat is calorie. 5.
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1 cal is the amount of heat necessary to raise the temperature of 1 g of water by 1 Celsius degree. Kilocalorie: (kcal or Calories), the heat necessary to raise 1 kg of water by 1 Celsius degree. Heat as Energy Transfer 4.186 J = 1 cal 4.186 kJ = 1 kcal Heat is energy transferred from one object to another because of a difference in temperature